https://llvm.org/bugs/show_bug.cgi?id=26884
Bug ID: 26884
Summary: clang O3/O2 error for Linpack with NEON instructions
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Keywords: compile-fail
Severity: normal
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: junaidsh...@siswa.um.edu.my
CC: llvm-bugs@lists.llvm.org, renato.go...@linaro.org
Classification: Unclassified
Created attachment 16012
--> https://llvm.org/bugs/attachment.cgi?id=16012&action=edit
source file
I am using code Neonlinpack code from,
http://www.roylongbottom.org.uk/Raspberry_Pi_Benchmarks.zip
When I compile it with clang without any optimization flags, it runs OK. But
when I use O3/O2 flags in command,
clang -target armv7a-linux-gnueabihf -mfpu=neon -mfloat-abi=hard linpackneon.c
cpuidc.c -O3 -o linpackneon
I get the following errors
In file included from cpuidc.c:13:
In file included from /usr/include/math.h:426:
/usr/include/bits/mathinline.h:756:25: error: invalid output constraint '=&q'
in
asm
: "=t" (__value), "=&q" (__ignore), "=m" (__cwtmp), \
^
/usr/include/bits/mathinline.h:756:25: error: invalid output constraint '=&q'
in
asm
/usr/include/bits/mathinline.h:756:25: error: invalid output constraint '=&q'
in
asm
/usr/include/bits/mathinline.h:774:25: error: invalid output constraint '=&q'
in
asm
: "=t" (__value), "=&q" (__ignore), "=m" (__cwtmp), \
^
/usr/include/bits/mathinline.h:774:25: error: invalid output constraint '=&q'
in
asm
/usr/include/bits/mathinline.h:774:25: error: invalid output constraint '=&q'
in
asm
/usr/include/bits/mathinline.h:881:3: error: unknown register name 'st' in asm
__lrint_code;
^
/usr/include/bits/mathinline.h:876:40: note: expanded from macro '__lrint_code'
: "=m" (__lrintres) : "t" (__x) : "st");
What is the reason behind these errors. I do not encounter such errors with
GCC. The files can be downloaded from the above link and I am attaching
cpuidc.c in the attachments.
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